$ git clone -n https://src.fedoraproject.org/rpms/rust-tiny-dfr.git /var/lib/mock/f42-build-3364922-45045/root/chroot_tmpdir/scmroot/rust-tiny-dfr
Cloning into '/var/lib/mock/f42-build-3364922-45045/root/chroot_tmpdir/scmroot/rust-tiny-dfr'...
$ git fetch origin 5ff34b8ec8491e87c1908e60ad6c082eda5253ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tiny-dfr
 * [new ref]         5ff34b8ec8491e87c1908e60ad6c082eda5253ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ff34b8 Update to 0.3.3; Fixes: RHBZ#2330436